Viz from an open-source keylogger, with d3

This is a nice example of the "quantified self", and I wonder if there's a potential for insight regarding productivity.

For example, the weekly patterns are apparent: the weekends aren't labeled, but you can see repeating density patterns in the days 5/2/5/2/etc. The gap for dinner is there, too, and you can maybe see gaps for breakfast and lunch. I love the high-resolution detail, combined with the easily-visible macro patterns; there's much more to see than GitHub's punchcard, say. Of course it would be nice to zoom in and see what Tom was working on during those bursts of activity, but I can't imagine him sharing that publicly!

Keystrokes certainly don't tell the whole story in terms of productivity, but it does have the advantage that it's extremely easy to collect this information. There might be other bits that are easy to collect, too, such as the name of the front-most application, or GPS. Combining all the stuff that's easy to collect could be very interesting for introspection.

I really like the visualization as gel electrophoresis. What are axis? X is the letter, color/intensity is frequency, Y - I assume is the time? If Y is the time, I can imagine that there would be mostly times without any activity punctuated by brief blips where almost all the letters are lit up.

Is it just that the time span is shorter than I expect, and that just shows a 30min interval or so? Is this just typing from one sitting?

E is typically the most used letter in plain text, I'm surprised how infrequently this shows up.